Table 1.
Weighted proportions of weight status and exposure to SHS among 6- to 19-year-olds, 2007–2010 NHANES (n = 2,670).
| Characteristic | Percent (95% CI) |
|---|---|
| Weight categories | |
| U.S. definitiona | |
| Normal/underweight | 66 (64, 68) |
| Overweight | 15 (14, 16) |
| Obese | 19 (17, 21) |
| International definitionb | |
| Normal/underweight | 65 (63, 67) |
| Overweight | 20 (19, 22) |
| Obese | 15 (13, 16) |
| Exposure assessment | |
| NNAL exposure | |
| Below LOD (< 0.001 ng/mL creatinine) | 53 (48, 57) |
| Low (≥ 0.001 & < 0.005 ng/mL creatinine) | 24 (21, 27) |
| High (≥ 0.005 & < 0.082 ng/mL creatinine) | 23 (18, 25) |
| Cotinine exposure | |
| No (< 0.05 ng/mL) | 57 (53, 61) |
| Low (≥ 0.05 & < 0.0268 ng/mL) | 21 (19, 24) |
| High (≥ 0.268 & < 14.6 ng/mL) | 22 (18, 25) |
| Self-report of household smokers | |
| None | 86 (85, 89) |
| One | 8 (7, 10) |
| Two or more | 6 (4, 9) |
| Abbreviations: CI, confidence intervals; LOD, limit of detection; NHANES, National Health and Nutrition Examination Survey; NNAL, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol; SHS, secondhand smoke. The total estimated population using the sampling weights is 31,119,675. aOverweight was defined as having a body mass index ≥ 85th percentile and < 95th percentile and obesity was defined as having a body mass index ≥ 95th percentile by age and sex, based on the 2000 CDC growth charts. bOverweight and obesity is defined as having a body mass index that corresponds to a body mass index of 25 and 30 at age 18 years, respectively, based on the International Obesity Task Force growth charts. | |